MarsDB is a lightweight client-side MongoDB-like database, Promise based, written in ES6
MarsDB is a lightweight client-side database.
It based on a Meteor’s minimongo mathing/modifying implementation. It carefully written on ES6, usess modular lodash, have a Promise based interface and may be backed with any storage implementation (LevelUP, LocalStorage, IndexDB, etc). It also supports observable cursors.
MarsDB supports any kind of find/update/remove operations that Meteor’s minimongo does. So, go to the Meteor docs for supported query/modifier operations.
You can use it in any JS environment (Browser, Electron, NW.js, Node.js).
Include marsdb.angular.js after marsdb.min.js and angular.js in your <head>. Then add a MarsDB dependency in your module. That's it. Now you can use $collection factory. For example:
angular.module(‘app’, [‘MarsDB’])
.controller(function($scope, $collection) {
const posts = $collection(‘posts’);
// All methods in $collection returns a $q promise
// So you don’t need to manually call $digest
posts.find({authorId: 123}).observe((docs) => {
$scope.posts = docs;
}, $scope).then(() => {
$scope.loaded = true;
});
// $scope at last argument needed for auto-binding
// to a “$destroy” event of the scope for stop
// observing changes. You can call it manually and
// don’t pass last argument.
});
You also can use MarsDB within browserify environment. Just require(‘marsdb/dist/angular’) and MarsDB module will be added to the angular. Angular must be defined in a window or must be available as a module require(‘angular’).
The ./dist folder contains already compiled to a ES5 code, but some polyfills needed. For using in a browser you must to include marsdb.polyfills.js before marsdb.min.js. In node.js you need to require(‘marsdb/polyfills’).
It sets in a window/global: Promise, Set and Symbol.
import Collection from ‘marsdb’;
import LocalStorageManager from 'marsdb/lib/LocalStorageManager';
// Setup different id generator and storage managers
// Default storage is in-memory
Collection.defaultStorageManager(LocalStorageManager);
Collection.defaultIdGenerator(() => {
return {
value: Math.random(),
seed: 0,
};
});
const users = new Collection(‘users’);
const posts = new Collection(‘posts’);
posts.find({author: ‘Bob’})
.sort([‘createdAt’])
.then(docs => {
// do something with docs
});
An order of pipeline methods invokation is important. Next pipeline operation gives as argument a result of a previous operation.
const posts = new Collection(‘posts’);
posts.find()
.limit(10)
.sortFunc((a, b) => a - b + 10)
.filter(doc => Matsh.sqrt(doc.comment.length) > 1.5)
.map(doc => doc.comments.length)
.reduce((acum, val) => acum + val)
.then(result => {
// result is a sum of coutn of comments
// in all found posts
});
Observable cursor returned only by a find method of a collection. Updates of the cursor is batched and debounced (default batch size is 20 and debounce time is 1000 / 15 ms). You can change the paramters by batchSize and debounce methods of an observable cursor (methods is chained).
const posts = new Collection(‘posts’);
const stopper = posts.find({tags: {$in: [‘marsdb’, ‘is’, ‘awesome’]}})
.observe(docs => {
// invoked on every result change
// (on initial result too)
stopper.stop(); // stops observing
}).then(docs => {
// invoked once on initial result
// (after `observer` callback)
});
Joined objects is not obervable yet.
const users = new Collection(‘users’);
const posts = new Collection(‘posts’);
posts.find()
.join(doc => {
// Return a Promise for waiting of the result
return users.findOne(doc.authorId).then(user => {
doc.authorObj = user;
return doc;
});
})
.join(doc => {
// Also any other “join” mutations supported
doc.another = _cached_data_by_post[doc._id];
// You need to return a document, bacause it's
// a pipeline operation
return doc;
});
const posts = new Collection(‘posts’);
posts.insert({text: ‘MarsDB is awesome’}).then(docId => {
// Invoked after persisting document
})
posts.insertAll(
{text: ‘MarsDB’},
{text: ‘is’},
{text: ‘awesome’}
).then(docsIds => {
// invoked when all documents inserted
});
const posts = new Collection(‘posts’);
posts.update(
{authorId: {$in: [1, 2, 3]}},
{$set: {text: ‘noop’}}
).then(result => {
console.log(result.modified) // count of modified docs
console.log(result.updated) // array of updated docs
console.log(result.original) // array of original docs
});
const posts = new Collection(‘posts’);
posts.remove({authorId: {$in: [1,2,3]}})
.then(removedDocs => {
// do something with removed documents array
});
I’m waiting for your pull requests and issues.
Don’t forget to execute gulp lint before requesting. Accepted only requests without errors.
See License
FAQs
MarsDB is a lightweight client-side MongoDB-like database, Promise based, written in ES6
The npm package marsdb receives a total of 1,088 weekly downloads. As such, marsdb popularity was classified as popular.
We found that marsdb demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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